Wireless telegraphy.



.N0.853,929. f 'PATENTED MAY14,1907.. W. W. MASSIB.

WIRELESS TELBGRAPHY.

APLIGATIQN FILED Nov. 4, 1905.

'n WHA UNITED srArns PATENT olf-iler@ .Y l

WALTER W. MASSIE, OF PROVIDENCE, RHODE ISLAND.

WIRELESS TELEGRAPHY- .T0 a/ZZ, whom t may concern:

1 Be it known that LWALTERW. MAssIE, a citizen el the United States, residing at Providence, inthe county of Providence and State of Rhode Island, have invented new and useful Improvementsin -Wireless Telegraphy, '-of which the following-is a specification.

This invention relates to wireless telegrasv p hy, one of the principal features ofthe inventlon being. in'a wave-frequency oscillatory rei ceiving circuit of a novelcharacter, by which certain improved results are obtained. One ofthcse results is sharp, accurate tuning another is the amplification; or buildil'ig up weak siv'nals th atordinarfily are destroyed' andlost. n the latoryl circuit resistance and it isessential that the resistance be constant as contradistinguishedfrem a' variable resistance such as' that by`acoherer or a responder.- 1 Ifnd'fthat'I can secure the best possible p resent case the-closed oscilresults by providing a closed .oscillatory-cir-f cuit havingresistance, capacitynd inductance, each constant, by virtue of which I can secure accurate tuning and amplification of Vsignals in the receiving circuit, which sigmals may be readily detected in a suitable in.

strument, such asa telephone receiver.

When I-l state that the three factorsin question are constant, I donot ymean to indicate that adjustment cannot be obtained, adjusting'tothe va For I provide means for rious wave lengths.

In the drawings, Figuresl, 2 and 3 are diagramsshowing several of the vmany ways in which my invention can be advantageously put into practicaluse.

In Fig. .lfof thev drawings, I have repref sented a magnetic detector of familiar kind, raid detector in t'he` present case having pri` nary and secondary coils, as 2 and 3, respecivel-y. The 'core' for the' detector is riesiglated by t .and it is represented as consistng 'of an endless iron band or cable with which are represented associated magnets,

is 5, of the permanent horse shoetype. I rave described ,briefly a well-known form )frnagnetic detector which acts in 'the cusl,omary mannerfthe cable or band '4 being noved 4in any desirable way.

' The vertical -and ground connections are lenoted by 7` and 8, respectively, and their nner terminals are associated inan adjustble manner, as' at 7 and 8 withthe primary l. This result can be accomplished by bar- `Specification of Letters Patent. i Application led November 4, 1905. Serial No. 285,890.

as i'ndu'ctance, capacity and presented ,inggthe signals. A telephone receiver is represented at 13 Patenten Ma/ym, 19o?.

ing the primary of insulation longitudinally i thereof. By adjusting .the vertical and ground connections relatively to the primary 2, I can ,vary resistance and induct'ance by throwing in or cutting out helices of thepri# mary 2.

A condenser is shown at 9 connected by conductor, as 10, with the primaryiZ'at 18, vand by conductor 1.1. with primary'2 at 8 and 19, respectively, the closed oscillatory cir- -cuit shown in Fig. 1 comprising the condenser 9, the conductors lOIand 11 andthe primary 2 between the points 1 8 and 8.`

. The contacts 7 and 8 are adjusted tohar.- monize the oscillations of the vertical system and the closed circuit with'the oscillations of the vreceived signals. The condenser 9 is made-.adjustable-to increase range of the closedcircuit.

I`provide for the adjustment of the three factors inductance, capacity and Vresistance vas will be understood from the described re..

lat-ion of parts but when once the adjustment 1s made,-it is maintained unless it be desired to adapt the instrument to oscillations of a A diiierent period, when adjustments are made.

When adjusted oscillations areset upin i the Vertical 7, pri mary 2, between the points 7 and -8 and ground 8, corresponding oscillations are set up in thevclosed circuit described and as the three factors described as possessed by the receiving circuit are constant, the oscillations in said receiving circuit willy be in harmony vat all times with those set up in the 'vertical 7, primary 2, 'between the points 7 'and 8, and ground 8. Thus weak siifals'are amplified or .built up while on the ot er hand, when a coherer or responder ',is used, the eXtreme variation in its resistance changes the period of oscillation thus destroy- Fig. 2 from that' shown in Fig. 1 i-s in the characterof secondary 3a. The secondary 3? consists of a shallow coil surrounding the rimar'y'Z and movable' longitudinally of the atter. In Fig. 3' `YI showthe vertical and ground connections 7 and 8 respectively as connected With a single coil 2b, a telephone,

as 13, being connected by conductors, as 14a, with the opposite ends oi the coil 2b. ing the conductors 14a between the telephone 13 and the coil 2l? is a conductor, as 16, intersected by a condenser as 9, whereby the condenser forms part of a closed oscillatory receiving circuit including the coil 2b. I have designated similar parts in the three diagrams .b like characters.

What I c aiin is:

1. In wireless telegraphy, a Wave-frequency oscillatory-receiving circuit including a magnetic-detector coil and capacity, said coil constituting inductance for said circuit and being together with' the capacity, adjustable for tuning said circuit.

2. In Wireless telegraphy, a closed wavefrequency oscillatory circuit including a magnetic-detector coil and capacity, said coil constituting in( luctance ior the circuit and being with the capacity adjustable for tuning said circuit. Y

3. In Wireless telegraphy, a closed. wavefrequency oscillatory receiving circuit including the coil of a inagnetic-detector, which coil constitutes the inductance of said circuit,

the latter also including capacity, and verti' cal and ground connections adjustably connected with the4 coil to vary the inductance, and the-capacity being also adj'ustablasaid adjustments being for the purpose of tuning said circuit.

4. Inwireless telegraphy, two oscillatory circuits, one oi' Which'is open and the other closed andA .all Wave-frequency, having a magnetic-detector coil common thereto, the closed circuit having capacity and inductance, the inductance consisting Voi said coil.

5. In Wireless n telegraphy, a wave-frequency oscillatory receiving circuit including inductance and capacity adjustable for tuning the circuit, the inductance consisting of a magnetic-detector coil, and the resistance, inductance and capacity of said circuitbeing constant when the same is tuned.

6. In Wireless telegraphy, a closed Wavei'requency oscillatory receiving circuit including ythe coil ofa magnetic-detector and capacity, saidcoil constituting the inductance for said circuit and the.capacity being'adinstable, and vertical and ground connections adjustably connected with the coil to adjustthe inductance of the circuit, said adjustment being for tuning, the resistance, capacitf-and inductance When the circuit is tuner being constant.

7. In wireless telcgraphy, two oscillatory circuits, one of which is open and the other closed and all wave-frequency, having a magnetic-detector coil corninon to both, and the inductance and capacity of both of which are adjustable.

In testimony whereof I have hereunto set iny hand in presence of two subscribing wit'- nesses. f

WALTER W. MAssIE,

Witnesses'.

HEATH SUTHERLAND, BERNARD I. VAsnoN. 

